noun 1. a bone that develops from membranous tissue. noun 1. any bone that develops within membranous tissue, such as the clavicle and bones of the skull, without cartilage formation Compare cartilage bone membrane bone n. A bone developed within the membrane of a connective tissue.

membrane expansion theory n. The theory that adsorption of anesthetics into membranes alters the membrane function to produce anesthesia.

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